Mixing of fermions and spectral representation of propagator

Abstract

We develop the spectral representation of propagator for $n$ mixing fermion fields in the case of $\mathsf{P}$-parity violation. The approach based on the eigenvalue problem for inverse matrix propagator makes possible to build the system of orthogonal projectors and to represent the matrix propagator as a sum of poles with positive and negative energies. The procedure of multiplicative renormalization in terms of spectral representation is investigated and the renormalization matrices are obtained in a closed form without the use of perturbation theory. Since in theory with $\mathsf{P}$-parity violation the standard spin projectors do not commute with the dressed propagator, they should be modified. The developed approach allows us to build the modified (dressed) spin projectors for a single fermion and for a system of fermions.

22 pages, this is refreshed and extended version

References in corpus (5)

• Unitarity of the Leptonic Mixing Matrix
• Pole Mass, Width, and Propagators of Unstable Fermions
• Simple On-Shell Renormalization Framework for the Cabibbo-Kobayashi-Maskawa Matrix
• Mixing angles of quarks and leptons in Quantum Field Theory
• Mixing of fermion fields of opposite parities and baryon resonances

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• The neutrino propagator in matter and its spin properties
• Neutrino propagation in media and axis of complete polarization
• Fermion propagator diagonalization and eigenvalue problem